Restructuring and Other Items, net (Tables)

12 Months Ended

Dec. 31, 2017

Restructuring and Other Items, net [Abstract]

Schedule of restructuring charges

The following table outlines the amount of restructuring charges recorded within the Consolidated Statements of Income, and the segments they relate to:

Restructuring and Other Items, net	Year Ended December 31, 2017
	2017			2016			2015
	(millions of dollars)
Impairment of assets
Specialty Minerals	$	5.3		$	-		$	-
Performance Materials		-			-			-
Energy Services		-			18.5			33.0
Corporate		-			-			1.2
Total impairment of assets charges	$	5.3		$	18.5		$	34.2
Severance and other employee costs
Specialty Minerals	$	5.0		$	-		$	-
Performance Materials		-			-			-
Refractories		-			-			2.0
Energy Services		1.7			12.7			9.0
Corporate		4.1			-			-
Total severance and other employee costs	$	10.8		$	12.7		$	11.0
Other
Refractories	$	-		$	(2.0	)	$	-
Energy Services		(1.1	)		(0.9	)		-
Total restructuring and other items, net	$	15.0		$	28.3		$	45.2

Reconciliation of restructuring liability

The following table is a reconciliation of our restructuring liability balance:

	(millions of dollars)
Restructuring liability, December 31, 2016	$	3.6
Additional provisions		10.8
Cash payments		(6.3	)
Restructuring liability,  December 31, 2017	$	8.1